Sewing-machine



` (No Model.) 2 sheets-sheet 1.

' C. R. SQUIRE. SEWING MACHINE. No. 432,955. Patented July 22, 1890.

(No Model.) 2 Sheets-Sheet 2. C. R. SQUIRE. SEWING MACHINE.

No. 432,955. Patented July 22, 1890.

NITED STATES PATENT OFFICE.

CHARLES R. SQUIRE, OF BROOKLYN, NEW YORK, ASSIGN-OR TO FREDERIC OONDIT, OF MORRISTOYN, NEW' JERSEY.

sEwlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 432,955, dated July 22, 1890.

pplication tiled August 31, 1887. Serial No. 243,383. (No model.)

T0 all whom it may concern:

Be it known that I, CHARLES R. SQUIRE, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Sewingdllachines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Like letters indicate like parts.

Figure l is a front elevation, partly in vertical section, showing such parts of asewingmachine as embody my invention. Fig. 2 is a transverse vertical sect-ion on the line 0o t of Fig. 1. Figs. 3 and 4 show in front elevation the feed and shuttle carriers at the end of their forward and backward movements, respectively, and thelink operating the same. Fig. 5 is a side elevation as seen on sectionline y y of Fig. l.

My invention relates to means of imparting reciprocating motion to the needle-arm and feed-carrierand shuttle-carrier of a sewingmachine without the use of a driving-belt; and it consists of a worm-wheel rigidly mounted upon the main driving-shaft of the machine and gearing with a worm mounted onashaft at a right angle with said main shaft, which worm, by means of a crank-pin at its end, moves backward and forward a link-bar, thereby giving an oscillating movement to the pivoted feedcarrier and the pivoted shuttle-carrier connected with the said feedcarrier, as hereinafter described.

In the drawings, A represents the table, B the legs, and O the bed-plate of a sewing-machine. The bed-plate is secured to the table by screws or otherwise. The iixed arm D has the integrally-formed standard E,and is fastened to the bed-plate by bolts F. A vibrating needlearni G is pivoted at G2 to the arm D. The bed-plate C has an opening at C. The needle-arm, below its pivot-bearing, extends vertically downward through said Opening C and below the table A. At its opposite end the needle-arm G carries a needlebar H in the usual manner. The needle-bar H has the usual reciprocating motion vertically in the guide of the standard E. The lower end of the needle-arm G is longitudinally slotted, as shown at g. A shaft I is supported by hangers O2 O3, which extend downward from the bed-plate C. The shaft I has a crank I, and the crank end of said shaft passes through and is mounted in the bearing C4, formed in the hanger O2, and the opposite end of said shaft has a conical recess e', which receives a correspondinglyshaped coned screw-bolt C5, which passes through the hanger O3, and is adj usted therein to support said shaft at that end and to take up the lost motionin the shaft-bearings- The pin of the crank I engages with the slot g of the needle-arm G. Said shaft I also has a worm-gearing K formed upon it.

M is the main driving-shaft of the machine, mounted in the legs B B. A iiy-wheel M is mounted upon the main shaft, and a treadlebar or pitman revolves said shaft and wheel by the usual treadle. A worin-wheel L is secured upon said shaft M and engages with the worm K of the shaft I. A bracket C6 is cast or secured upon the under side of the bed-plate C. A feed-carrier N, which is sector-shaped, is mounted upon said bracket by a pivot, and is capable of an oscillating motion, which is communicated to it by a link or bar P. The lilik P is pivoted to the feedcarrier N at one end, as shown in Figs. 3 and 1, at p an-d at the other end to the lower end of the needle-arm G at p. (See Fig. l.) A shuttle-carrier O is mounted upon the bracket O6 by a pivot 0. The carrier O has a shorter radius than that of the carrier N, and is pivoted upon said bracket at a point higher than the pivot n. The carrier O derives motion from the carrierN by means of a pin n', whichprojects from its face and which engages in a slot o2 of the carrier N. The carrier O has a rest 03, (see Fig. 5,) in which the shuttle R is supported. A

The feed-bar S (whose shape is shown in Fig. 5) is suspended horizontally beneath the bed-plate O, and is supported at one end by a pin t, secured to a bracket T, which projects downward from said bed-plate. Said feed-bar is slotted at one end at s to receive the pin t and at -its opposite end rests upon the periphery of the carrier N.

The peculiar construction of the feed-carrier N and its cammed edge is made the subject of a separate application for Letters Patent filed by me March l5, 1889,' Serial No. 303,443, and needs no further description here.

The operation of my device is as follows: The pitman M2 is operated by a tread le in the usual manner, and revolves the fly-wheel M and the main shaft M. The worm-wheel L, rigidly mounted upon the shaft M, turns with it., and, engaging with the worm K of the shaft I', turns the shaft I. By this wormgearing the shaft I is Arotated in a direction at a right angle with the shaft M. The crank I turns with the shaft I', and by means of its pin engaging with the slot g of the needlearm G, gives a vibrating motion to said needle-arm, which motion causes the needle-bar II to alternately move up and down, and at the same time communicates a reciprocating motion to the link or bar P, pivoted to said needle-arm at p. The pivotal connection p of thelink-bar P with the feed-carrier N causes said carrier N to oscillate vertically upon the bracket C6. The pin-and-slot connection n 02, between the feed-carrier N and shuttle-carrier O,gives an oscillating movement to the shuttlecarrier O, which has its separate pivotalbearing on the bracket C6 at 0. As the pivot o is located above the pivot n, and the distance between the points n' o is less than the distance between the points n p, it is evident that the carriers have a differential motion and that the shuttle-carrier O has a quicker travel and describes a longer arc, so that the shuttle-carrier can advance rapidly and pass the Vshuttle through the loop of the stitch while the feed-carrier follows more slowly and gives time for the needle to pass into and out of the cloth while the feed itself is at rest, as will be more fully specified in my other application for Letters Patent.

In sewing-machines as hitherto constructed the power is communicated from the wheel to the stitch-forming mechanism by means of a beltpassing over said wheel and over a pulley, the latter turning a main shaft on the machine which extends beneath the bedplate. My device dispenses entirely with such belt-connection and substitutes a worm-gearing for it.

In the sewing-machine as commonlyconstructed only a comparatively f ew stitches can be produced by each revolution of the drivin g-wheel. The number of stitches formed is in ratio to the relative diameters of the wheel and pulley. On the one hand the driving-wheel cannot practically exceed acertain diameter and weight and on the other hand the pulley cannot practically be of less than a certain diameter. If the pulley is too small, the belt will slip upon it, because there is not a sufficient binding-surface and the leverage at which the power is applied to the pulleyis too short. Especially when heavy fabrics are used and the resistance to the needle which they offer is consequently great, the belt must bc tightened in order to secure the necessary frictional hold upon the pulley. Again, it is a common experience in the use of such machines to find that the belt is stretched by the constant strain and fits loosely, so that it is necessary to occasionally shorten the belt in order that it may bind the wheel and pulley more snugly.

By substituting the worm-gearing for the belt I secure a simple and durable driving mechanism which is positive and certain in its motion and capable of great speed and enables the formation of a greater number of stitches for each revolution of the fly-wheel.

I claim as a new and useful invention, and desire to secure by Letters ]Eatent-A l. In a sewingmachine,the combination of the driving-shaft suitably mounted, the wormwheel fastened on said shaft, the Worm-shaft suitably mounted and having a crank, the

.worm formed on said worm-shaft and engagQ ing with the worm-wheel of the main shaft, the bed-plate and standard, the needle-arm pivotally mounted on said standard and slotted at its lower end to engage with the crank of the worm-shaft, and the needle-bar pivoted to the needle-arm and adapted to reciprocate vertically in guides of the standard, substantially as speciied.

2. In a sewing-machine having a bed-plate, standard, and stitch-forming mechanism, t-he combination of a needle-arm pivoted to said standard, and driving mechanism consisting of a suitably-mounted rotatable worm-gearing and crank-pin adapted to impart a reciprocating motion to said needle-arm, substantially as specified.

3. In a sewing-machine having abed-plate and standard, the combination of a drivingshaft suitably mounted and having a wormlwheel, a worm-shaft suitably mounted and having a Worm and crank, a vibrating needlearm pivoted to said standard and engaging with said crank, a link-bar pivoted to said needle-arm at its lower extremity, and au oscillating feed-carrier pivoted to saidlink-bar and mounted upon a bracket of the bed-plate, substantially as specified.

4. In a sewing-machine, the combination, with a stitch-forming mechanism and a vibrating needle-arm having a slotted end, of a driving-shaft provided with a Worm-wheel, and a worm-shaft engaging with said wormwheel and provided with a crank connecting with the slotted end of said vibrating needlearm, substantially as specified.

5. In a sewing-machine, the combination,

with a worm and worm-shaft and a drivingshaft provided with a worm-wheel, of an oscillating feed-carrier pivoted upon a bracket of the bed-plate, and an intermediate linkconnection between said feed-carrier and worm-shaft, substantially as specified.

6. In a sewing-machine, the combination,

IOO

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In testimonyT whereof I affix my signature in presence of two Witnesses.

CHARLES R. SQUIRE.

\Vitnesses:

SOLON C. KEMON, J. MIDDLETON. 

